root
90 lines
2.3 KiB
PHP
90 lines
2.3 KiB
PHP
<?php
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/**
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* CDN / 反代场景下解析访客真实 IP
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*/
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class ClientIpResolver
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{
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/**
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* @return string
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*/
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public static function resolve()
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{
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static $resolved = null;
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if ($resolved !== null) {
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return $resolved;
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}
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$candidates = [];
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if (!empty($_SERVER['HTTP_CF_CONNECTING_IP'])) {
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$candidates[] = (string) $_SERVER['HTTP_CF_CONNECTING_IP'];
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}
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if (!empty($_SERVER['HTTP_TRUE_CLIENT_IP'])) {
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$candidates[] = (string) $_SERVER['HTTP_TRUE_CLIENT_IP'];
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}
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if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
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$candidates[] = (string) $_SERVER['HTTP_X_REAL_IP'];
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}
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if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
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foreach (explode(',', (string) $_SERVER['HTTP_X_FORWARDED_FOR']) as $part) {
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$part = trim($part);
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if ($part !== '' && strcasecmp($part, 'unknown') !== 0) {
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$candidates[] = $part;
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}
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}
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}
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if (!empty($_SERVER['REMOTE_ADDR'])) {
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$candidates[] = (string) $_SERVER['REMOTE_ADDR'];
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}
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foreach ($candidates as $candidate) {
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$ip = self::normalizeIp($candidate);
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if ($ip === null) {
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continue;
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}
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if (self::isPublicIp($ip)) {
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$resolved = $ip;
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return $resolved;
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}
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}
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foreach ($candidates as $candidate) {
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$ip = self::normalizeIp($candidate);
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if ($ip !== null) {
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$resolved = $ip;
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return $resolved;
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}
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}
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$resolved = '0.0.0.0';
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return $resolved;
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}
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/**
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* @param string $ip
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*/
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public static function normalizeIp($ip)
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{
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$ip = trim($ip);
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if ($ip === '' || strcasecmp($ip, 'unknown') === 0) {
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return null;
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}
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if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6) === false) {
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return null;
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}
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return $ip;
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}
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/**
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* @param string $ip
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*/
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private static function isPublicIp($ip)
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{
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return filter_var(
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$ip,
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FILTER_VALIDATE_IP,
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FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE
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) !== false;
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}
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}
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